In 2007 he joined Piraeus Bank and in 2009 he was a member of the Executive Committee for the creation of the JV with BNP Paribas Wealth Management, one of the most attractive international wealth management hubs in Greece at the time. In 2013 he participated in building and establishing the Greek branch of Credit Suisse (Luxembourg) SA, offering state-of-the-art onshore advisory services coupled with international booking possibilities to High Net Worth Clients in Greece. In 2017-18 leading a high caliber team he participated in increasing considerably EFG Bank Luxembourg market share in the Greek market.

Kostas has significantly contributed to the business development of KM Cube and continues to be an integral part of the team.